编译问题汇总¶

1 gcc¶

1.1 “'xxx' 不是一个类型名”¶

分析：此类错误就是编译器并没有找到 "xxx" 类的定义
原因：
没有包含头文件
多个文件中使用了相同的防止头文件重复包含的宏，导致某个头文件没有被包含进来

1.2 "error: implicit declaration of function"¶

错误如下

/root/nfs-ganesha/src/libntirpc/src/work_pool.c:301:3: error: implicit declaration of function ‘assert’ [-Werror=implicit-function-declaration]
   assert(!wpt->wakeup);

原因：c++ 编译器默认开启了 -Werror=implicit-function-declaration 选项，当使用一个没用提前声明的方法时报错。
解决办法：头文件包含这个方法声明的问题。

1.3 错误：‘xxx’的声明指定了两个以上的数据类型¶

原因：在定义枚举或结构体、类时结尾没有加分号 ;。

1.4 error: multi-line comment¶

原因是宏定义非一行，在宏定义的行尾使用 \ 连接符导致的。这时不能使用单行注释 //，而要使用使用多行注释 /* */ 。 - 示例

/*#define ATTR_MASK (BASIC_STATS | \
                 BTIME |\
                 VERSION)
*/

2 make¶

2.1 unable to guess system type¶

checking build system type... libltdl/config/config.guess: unable to guess system type

This script, last modified 2008-01-23, has failed to recognize
the operating system you are using. It is advised that you
download the most up to date version of the config scripts from

  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
and
  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD

If the version you run (libltdl/config/config.guess) is already up to date, please
send the following data and any information you think might be
pertinent to <config-patches@gnu.org> in order to provide the needed
information to handle your system.

config.guess timestamp = 2008-01-23

uname -m = aarch64
uname -r = 4.19.90-2107.6.0.0098.oe1.bclinux.aarch64
uname -s = Linux
uname -v = #1 SMP Wed Sep 1 23:13:50 EDT 2021

/usr/bin/uname -p = aarch64
/bin/uname -X     = 

hostinfo               = 
/bin/universe          = 
/usr/bin/arch -k       = 
/bin/arch              = aarch64
/usr/bin/oslevel       = 
/usr/convex/getsysinfo = 

UNAME_MACHINE = aarch64
UNAME_RELEASE = 4.19.90-2107.6.0.0098.oe1.bclinux.aarch64
UNAME_SYSTEM  = Linux
UNAME_VERSION = #1 SMP Wed Sep 1 23:13:50 EDT 2021
configure: error: cannot guess build type; you must specify one

出现这种问题的原因是识别不出系统架构类型，这时需要更新 2 个文件 config.guess 和 config.sub 下载地址： - http://git.savannah.gnu.org/gitweb/?p=config.git ;a=blob_plain;f=config.guess;hb=HEAD - http://git.savannah.gnu.org/gitweb/?p=config.git ;a=blob_plain;f=config.sub;hb=HEAD

从上面地址下载后替换项目下同名文件，再重新编译。